UPDATE: Steve Sergeant posted a terrific Wildebeat audiocast on this last year – The Poop on Mount Whitney
Pack out what you pack in.
This is the age-old outdoor rule. And here, taking this decree to the extreme, is a good friend of mine who recently climbed Mt. Whitney in California.
I’ll let you guess what he’s packing out.
I hiked Whitney in 2006. Some of the pit toilets were still in place, though they stunk to high Heaven.
In 2007 you must bag it.
Pack-out kits are available at the InterAgency Visitors Center in Lone Pine, and at Crabtree Ranger Station. They are also available at many stores that sell hiking, backpacking and climbing equipment. You should also bring toilet paper and hand sanitizer. A kit will serve a person for 2 to 3 days.
Each kit contains two plastic bags for securely “double-bagging” your waste. The large inner bag contains a powder that absorbs liquids and turns into an odor-fighting gel. The outer zip-closure bag seals everything up for transport.
How to Use Pack-Out Kits
1. Find a secluded location.
2. Spread the large inner bag on the ground. Don’t spill the powder!
3. Crouch over the bag and relieve yourself. Dispose of toilet paper in the bag.
4. Tie a loose knot in the bag, and then seal it inside the zip-close outer bag.
It’s no big deal. These pack-out kits work quite well.
Organize to hike Mt. Whitney, highest peak in the continental USA.
besthike.com 
We did a story about this last year. Now, all of a sudden, a year later, it’s big news from the New York Times to a wide range of blogs.
See: “The Poop on Mount Whitney” http://www.wildebeat.net/index.cgi/2006/11/02#E063
Right. I listened to that!
I’ve added a conspicuous link to your post.
Thanks Steve.